How Much Work Does It Take to Fire a 2kg Projectile at 50m/s?

[mmiller9913]

Homework Statement

Determine the amount of work done in firing a 2.0-kg projectile with an initial speed of 50 m/s. Neglect any effects due to air resistance

Homework Equations

W = delta K
K = 1/2mv^2

The Attempt at a Solution

just take K= 1/2(2)(50)^2 to get 2500...it seems to easy?

 

[PhanthomJay]

Homework Statement

Determine the amount of work done in firing a 2.0-kg projectile with an initial speed of 50 m/s. Neglect any effects due to air resistance

Homework Equations

W = delta K
K = 1/2mv^2

The Attempt at a Solution

just take K= 1/2(2)(50)^2 to get 2500 J[/color]...it seems to easy?

It only seems easy because you were able to astutely note that the work-energy theorem would give you the answer for total work done. Others might have tried to find force/distance/acceleration etc., to use in calculating the work done, but to no avail.